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P. NUONAN.

FURNAGE (No Model.)

110.440,112. Patented Nov.4,1890.

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PATRICK NOONAN,

FURNACE.

SPECIFICATION forming part of Letters P atent No. 44Q,112, dated November 4,1890.

Application filed May 5, 1890. Serial No. 350,618. (No model.)

T0 all whom it may concern.-

Be it known that I, PATRICK NooNAN, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Furnaces; and Ldo hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in furnaces well adapted for steam-boilers; and it consists in certain features of construction and in combination of parts hereinafter described, and pointed out in the claim.

In the accompanying drawings, Figure 1 is a side elevation of the steam-boiler with the setting shown in longitudinal vertical section through the center thereof. Fig. 2 is an elevation in section on line ,z e, Fig. 1'. Fig. 3 is a plan in section on bent line Qc oc, Fig. l.

A represents the steam-boiler, and B the brick setting.

C represents the lire-front, and C the doors for firing.

D is the ashpit, D the ash-pit door, and d the grates.

E is an air-duct opening at the rear of the setting, where it is provided with a door E', by partially opening or closing which the draft from the duct may be regulated, and by means of which door the draft may be entirely shut o. The walls of ductE are constructed,pref erably, of fire-brick or tile, and this duct extends forward on top of floor B of the setting and connects with a hollow bridge-wall F of similar construction. The duct of the bridge-wall connects at either end with ducts G, built in the walls of the fire-box, the said duct G extending forward and then upward, as shown, and connecting with a lateral duct H, the latter being located next inside the fire-front and extending over door C' and resting on and being supported by the jambs of these doors and by the lining c of the firefront. Duct H is provided with a series of eduction-openings h for discharging heated.

air into the fire-box above the fuel to commingle with the gases escaping from the fuel to render the same combustible. Inside of duct H is located a steam-pipe I, this steampipe having a series of small holes or jet-oriiices t', corresponding with and adapted to discharge through opening h aforesaid, whereby the jets of steam induce a strong current of air through the system of air-ducts just described. The inside walls of duct G are exposed to intense heat from their location at the side of the nre-box, and of course the hollow bridge-wall becomes heated to a high degree. Duct E from its length, location, and exposed position also absorbs much heat, so that the air in passing through this system of ducts becomes heated to such a high degree that when commingled with the products of combustion the whole volume is in a state highly combustible, and being ignited from the lire of the fire-box burns fiercely, the combustion being so perfect that little or no smoke is produced.

The combination, with a steam-boiler, a firebox setting of masonry, and hotfair space between the latter and the boiler, of a system of air-passages consisting of an air-duct opening at the rear and provided with a door for regulating the draft through this duct, said duct extending from the rear forward immediately beneath the hot-air space, a hollow bridge-wall in communication with the duct, side ducts in communication with the hollow bridge-wall, lateral duct having dischargeorifices extending completely across the fur nace and communicating with the side ducts, said duct located next inside the fire-front and between the lining c and the boiler, and a steam-pipe extending through the lateral duct and having discharge-orifices in line with the discharge-milices in the lateral duct, substantially as set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 16th day of April, 1890.

PATRICK NOONAN. Witnesses:

C. H. DORER,

WILL B. SAGE. 

